铜绿微囊藻水华对水泥界面磷素动态影响的模拟

生态与农村环境学报2015，31(3):366－371JournalofEcologyandRuralEnvironment铜绿微囊藻水华对水泥界面磷素动态影响的模拟朱咏莉1，吴清1，徐莎1，吴丽云2，韩建刚1(1.南京林业大学江苏省南方现代林业协同创新中心，江苏南京210037;2.江苏大学农业工程研究院，江苏镇江212013)摘要:采集太湖梅梁湾水样和底泥样，添加铜绿微囊藻(Microcystisaeruginosa)，模拟水华发生全过程，以揭示藻群动态对水－泥界面磷素变化的影响。培养期间(238d)，铜绿微囊藻一直处于“增殖－悬浮”交替状态。藻体增殖引起上覆水pH值平均升高11%～14%。藻体第1次大量增殖后，水中总磷(TP)含量降低90%以上，底泥有机磷(Or-P)含量明显增加。增殖-悬浮交替过程中，水溶性磷(WP)在TP中的比例从初始的93%降至11%。相比较而言，Or-P含量表现为降低和升高交替变化。水泥两相WP含量在藻体首次增殖后迅速降低，但此后平均回升2.7倍(水中)和1.7倍(底泥)。底泥碱性磷酸酶活性与Or-P含量之间呈显著负相关(P＜0.05)，与WP呈极显著正相关(P＜0.01)。可以认为，铜绿微囊藻水华过程中，部分藻体迅速衰败分解后释放数量可观的WP，这在一定程度上维持了藻群增殖－悬浮反复和交替发生。关键词:铜绿微囊藻;磷;碱性磷酸酶中图分类号:X52文献标志码:A文章编号:1673－4831(2015)03－0366－06DOI:10．11934/j．issn．1673－4831．2015．03．015EffectsofMicrocystisaeruginosaBloomonDynamicsofPhosphorusatInterfaceofWaterandSediments:ASim-ulationStudy．ZHUYong-li1，WUQing1，XUSha1，WULi-yun2，HANJian-gang1(1.CollaborativeInnovationCenterofSustainableForestryinSouthernChinaofJiangsuProvince，NanjingForestryUniversity，Nanjing210037，China;2.InstituteofAgriculturalEngineering，JiangsuUniversity，Zhenjiang212013，China)Abstract:WaterandsedimentweresampledfromtheMeiliangBayoftheTaihuLake，China，tobuildupasimulatedsediment-watersystemwithMicrocystisaeruginosaaddedforsimulationoftheoccurrenceofMicrocystisaeruginosabloom，withaviewtodefininghowandtowhatextentalgabloomcontributestovariationofphosphorusinthesediment-waterin-terface．Microcystisaeruginosainthewatercolumnalwaysstayedinastateofalternationofproliferationandsuspensionduringtheincubationperiod(238days)．ProliferationofthealgaeincreasedpHintheoverlyingwaterby11%－14%．Afterthefirstboomofproliferationofthealgae，TPinthewaterdecreasedbyover90%，whileorganicP(Or-P)inthesedimentincreasedsubstantially．Theproportionofwater-solubleP(WP)inTPdecreasedfromtheinitial93%to11%duringtheperiodofalternationofproliferationandsuspension，whilethecontentofOr-Palternateddecreasingandin-creasingduringtheperiod．WPcontentsinboththewaterandthesedimentdroppedrapidlytoaverylowlevelduringthefirstboomofproliferationofthealgae，butafterwards，th